High-temperature dust-removing and coke-removing integrated purifying process of biomass crude gas

Abstract

The invention discloses a high-temperature dust-removing and coke-removing integrated purifying process of biomass crude gas and provides a new process for high-efficiency purification of biomass high-temperature gas at low cost. The process comprises a high-temperature gas heat exchanger (A), a high-temperature gas purifier (B), a Venturi pulse back-blowing system (C), a gas preheater (D) and an electric-heating insulation system (E), wherein the five sets of equipment operate cooperatively to form a set of complete high-temperature gas purifying integrated device; a filtering medium in the high-temperature gas purifier is a modified ceramic membrane dust-removing pipe. When filtering cakes on the outer surface of the modified dust-removing pipe are deposited to certain thickness, deposited ash can be back-blown into an ash discharging hopper box for collection by the Venturi pulse back-blowing system. The high-temperature dust-removing and coke-removing integrated purifying process disclosed by the invention has the advantages that high-efficiency separation and integrated treatment of ash and coke components in biomass gas are realized; the dust-removing temperature is low so as to be beneficial to reducing the manufacturing cost of the equipment and prolonging the service life; biomass ash side products with commercial value are produced while the high-efficiency purification of the biomass crude gas is realized; the process flow is simple and flexible, the operation is simple, the purification cost is low and the suitability for industrial production is achieved.

Description

technical field [0001] The invention belongs to the technical field of high-temperature gas purification, and in particular relates to an integrated purification process of high-temperature dedusting and decoking of raw biomass gas. technical background [0002] In recent years, with the rise of low-carbon economy, the substitution of fossil energy such as coal, natural gas and oil by biomass has become a research hotspot in the field of new energy, which has important strategic significance and has been given enough attention by countries all over the world. Among the many new technologies for biomass energy utilization, biomass gasification technology is one of the fastest-growing and relatively mature engineering technologies. Biomass gasification is one of the important ways to convert primary energy into clean secondary energy. Its products are mainly combustible gases, which can also be processed into high-quality gases such as syngas and hydrogen after advanced treatm...

AI Technical Summary

Problems solved by technology

However, the common problem at present is that the gasification process will always produce a certain amount of tar and carry more fine ash particles, which will cause difficulty in gas purification, blockage and corrosion of pipelines, and will seriously affect the stable operation of related combustion equipment

The cyclone separation dust removal technology is the simplest, but it is difficult to achieve the ideal dust removal effect due to large fluctuations in gas production during the operation of the biomass gasifier

At present, the most common method is to use simple water washing to purify the gas. However, due to the existence of a large amount of tar in the biomass gas, the sewage discharged from washing contains more harmful substances such as phenols and benzene, which will bring more serious problems to the environment. pollution problem

Catalytic cracking or high-temperature thermal cracking technology is often used abroad to reduce the tar content in gas. Although catalytic cracking can remove more than 90% of tar, the tar in raw biomass gas is mainly composed of very complex condensed ring compounds. Catalytic cracking The process is easy to cause carbon deposition and deactivation of nickel-based catalysts, and the application of catalysts will greatly increase the production cost of biomass gas

Therefore, none of the above technical methods can completely remove the ash and tar in the biomass high-temperature gas, and it is easy to form secondary pollution due to tar and ash

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